package com.yumeko.Intercepter;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @program: ssp
 * @description:
 * @author: Zheng Hao
 * @create: 2020-01-15 19:54
 */
public class LoginIntercepter implements HandlerInterceptor {
    /**
     * 会在handler方法业务逻辑执行之前执行
     * 往往在这里完成权限校验工作
     * @param request
     * @param response
     * @param handler
     * @return  返回值boolean代表是否放行，true代表放行，false代表中止
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("LoginIntercepter preHandle......");
        String loginName = (String) request.getSession().getAttribute("LoginName");
        if (loginName == null) {//判断用户名
            String contextPath = request.getContextPath();
            if(contextPath.isEmpty()){//判断当没有项目名时候
                System.out.println("contextPath是空");
                response.sendRedirect("/");
                return false;
            }else {
                System.out.println(contextPath);
                response.sendRedirect(request.getContextPath());
                return false;
            }
        } else {
            return true;
        }
    }


    /**
     * 会在handler方法业务逻辑执行之后尚未跳转页面时执行
     * @param request
     * @param response
     * @param handler
     * @param modelAndView  封装了视图和数据，此时尚未跳转页面呢，你可以在这里针对返回的数据和视图信息进行修改
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    }

    /**
     * 页面已经跳转渲染完毕之后执行
     * @param request
     * @param response
     * @param handler
     * @param ex  可以在这里捕获异常
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}
